Charles h



(No Model.)

0. H. YARRINGTON.

MANUFACTURE OF WATCH BROWNS. No. 351,085. Patented Oct. 19, 1886.

UNITED STATES CHARLES H. YARRl NGTON, OF CHESHIRE, CONNECTICUT, ASSiGNOIt TO THE CHESHIRE VATCH COMPANY, OF SAME PLACE.

MANUFACTURE OF WATCH-CROWNS.

SPECIFICATION forming part of Letters Patent No. 351,085, dated October 19, 1886.

Application tiled March 3, 1886. Serial No. 103,537. (No model.)

To aZZ whom it may concern.-

Beit known that 1, CHARLES H. YARRING- TON, of Cheshire, in the county of New Haven and State of Connecticut, have invented certain new and useful Improvements in the Manufacture of Watch-Crowns, of which the following is a full, clear, and exact description, whereby any one skilled in the art can make and use the same.

My invention relates to the processes by which watch-crowns as specific articles are produced, and also to such steps in the art as relate to the attachment of the crown to the winding-spindle adapted for use in a watch.

The object of my improvement is to provide such articles in a cheap and durable form by the use of dies; and my improvement consists in the method of forminga watch-crown from a single piece of metalthatis stamped, drawn, corrugated, and formed by the several steps, as more particularly hereinafter described, and pointed out in the claims.

Referring to the accompanying drawings, Figure 1 shows both an edge and plan view of the circular blank from which the crownis formed. Fig. 2 is a detail view in central vertical section of the dies, betweenwhich the blank is formed in the second step in the process of forming the crown. Fig. 3 is a detail edge view of the crown-blank, showing the product of the second step in the method. Fig. 4 is a detail view in vertical section of the cupping-dies used in the third step in the method. Fig. 5 is a view in vertical central section of the cup-shaped blank, which is the product of the third step. Fig. 6 is a detail sectional view of the crown-corrugating dies used in the practice of the fourth step in the process. Fig. 7 shows in side elevation and in plan view the crown-blank after it has been corrugated. Fig. Sis a detail view in central section of the crown-blank after the nipple has been bored and a thread tapped to receive the threaded end of the winding-spindle, this being themodified form of fastening the crown to the stem. Fig. 9 is a detail side View of the crown and stem after the crown has been formed to final shape and the edge milled to fit the stem of the watch. Fig. 1O isa detail viewin central section of a crown,

showing a springbase and springin the modified form of fastening the crown to the stem. Figs. 11 and-l2 are views in central section of the watclrcrown, showing a stem with upset end and a stemsocket in the crown, illustrating the means of securing the crown to the stem.

In the drawings, the letter a denotes a diskshaped blank cut or punched from a sheet of metal of proper thickness by any ordinary method and means; b, a nipple left in reducing the edges of the blank a, forming finally the thick base 0 of the crown; (Z, the sides of the crown; e, the winding-spindle; e, the end of the spindle that is adapted to fit the socket f, which is made in the inner surface of the base of the crown.

The blank is provided duringthe process of its formation with a central indentation or thedrillguide, b, in the surface of the nipple,

and on the reverse or outer surface with a centering-mark, If, these guide-marks being preferably made by a central projecting point or punch in the recess of the female dies.

The blank c having been cut or punched from a sheet of metal as the first step in the process of making the crown, is nextsubj ected to the action of the dies 9 and g in the second step in the process, the socket in the female die 9 having preferably the central punch, 1 that forms the drill-guide b in the nipple b, the edges of the blank in this operation being greatly reduced in thickness on all sides of the central nipple that is left at substantially the full thickness of the blank a. In the next step of the process the blank,after having had the thin edges trimmed on a circle struck from the center of the base, is subjected to the process of the cupping-dies hand It, the bottom of the punch having a recess into which the nip- 9o ple b fits and thus centers the work and holds it while the edges are drawn and shaped. The thin edges of the blank are by this process bent and drawn to the cup shape shown in Fig. 5, the crown-blank now having the thick base 0 and thin sides d approximating the final form. The sides (I are still further thinned out by the action ofdies and the edge of the blank is again trimmed, as by turning or grinding, and is next crimped by the dies t '5, thus IOO forming the corrugated cup-shaped crown with the sides still flaring slightly outward, as shown in Fig. 7. The socketfis next drilled in the inner side of the base, the guidemark aiding in centering the drill, and into this socket the end e of the winding-spindle e is fitted. The next step in the process consists in closing the metal of the base firmly upon the end ot'the spindle when it is not threaded, and in curving the edges of the sides of the crown inward near the edge toward the spindle, producing the globular form shown in Fig. 9.

I do'not confine myself to the angular-or upset ends and compression of the nipple as a means of engaging the windingspindle in the socketf, but may make use of any equivalent and ordinary means, as a screw-thread on the stem and-a threaded'socket in the nipple, as shown in Figs. 8 and 10, for the purposeof securely fastening the crown and spindle together, as described.

As a final step, the edge of the crown is milled or turned out on its inner side on a curved plane parallel to and equidistant from the spindle, so that it will fit snugly about the stem of the watch while the spindle passes through an opening in the sum, as illustrated in Fig. 9.

In order toadapt the spindle and crown to a particular form of watchmovement in connection with which the spindle has a sliding and a rotary motion also in the stem and is held outward by a spring, an annular collar, 70, is fitted upon the inner end of the stem, rest.- ing against a shoulder, as at the base of the thread. When the spindle is secured to the crown, the collar is tightly held between the shoulder and the base and forms a broad rest to take the thrust of the spring.

The article substantially as herein shown and described forms the subject matter of another application filed by me in the Patent Oflice,and the following claims are to the method or process only. i

I claim as my invention-- 1. The improvement in the art of making -watch-crowns,which consists,first, in reducing the edges of a circular blank, leaving the center the full thickness of the blank to form a base at the center of the crown; secondly, in drawing out said edges and curving them upward to form the sides of said crown; thirdly, in corrugating the sides of the crown; fourthly, in drilling ahole in the base to receive the end of the winding arbor, and, fifthly, in closing the metal of the'base about the spindle end, whereby the crown is firmly secured upon the arbor. all substantially as described.

2. The improvement in the art of making watch crowns, which consists in blanking out a disk of metal of suitable size, indenting it upon its under side, whereby a guide-mark is formed to aid in the subsequent process, reducing said blank at its edges, leaving the cen= ter to form a base, then drawing said edges, curving them upward and corrugating them, then drilling the base to receive the end of the winding arbor, and, finally, closing the metal ofthe base upon the end of the windingarbor, whereby the crown is firmly secured upon the arbor, all substantially as described.

3. The method of making watch crowns, which consists in reducing the edge of a metal disk in dies, leaving the center to form a base, drawing, curving, and corrugating said. edge, drilling the base to receive a locking device on the end of the winding arbor, closing the metal ofthe base upon the arbor end, closing the edge of the crown inward,and then milling out the center to fit the watch-stem, all sub stantially as described.

CHARLES H. YARRINGTON.

Witnesses:

G. J. GAPEWELL. CHAS. L. BURDETT. 

